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Sand dams – A solution for dryland communities

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Sand dams are a simple, low cost and low maintenance, replicable rainwater harvesting technology. It’s a solution that focuses on community ownership and self supply that involves significant community contribution and locally supplied skills.

They provide a clean, local water supply for domestic and farming use and are suited to arid and semi-arid areas of the world.  A sand dam is a reinforced concrete wall (or a similarly robust and impermeable weir) typically built 1 – 5 metres high across a seasonal sand river. When it rains the dam captures soil laden water behind it – the sand in the water sinks to the bottom, whilst the silt remains suspended in the water.

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Water Solution for Disease Prevention in the Mentawai Islands

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Mercy Corps has been providing essential emergency relief to address the water, hygiene, and shelter needs of vulnerable and marginalized populations through program “Earthquake and Tsunami Relief to the Mentawai Islands”.

With our intervention and also based on need assessment results we make some water solution for disease prevention such as:

  1. Rain water harvesting using PVC pipe connected to PVC water storage (1000 l) with 2 water tap in their temporary houses.
  2. Water pontoon with hand pump in their water pond.
  3. Making dam (water catchment) for spring water and distributed by gravity using HDPE pipe to all water points.
  4. Using water filter with local materials such as sand, local gravel and active charcoal to all projects.

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